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In 1849, Meucci made various copper wire connections between himself and a patient. One end was inserted into the patient's mouth while he performed the same operation in another room. There was a fourth terminal attached to a magnet that caused a discharge. Next up was improving the quality of transmission and reception, so he worked on many prototypes until he achieved what we know as the teletrophon, the device he used to communicate with his wife. But Meucci didn't patent his invention since the Italian inventor didn't have a lot of money to pay for the patent. Although later in 1872, he gathered some pennies and patented it annually
In 1876, British inventor Alexander Graham Bell filed a patent for the telephone. It didn't take Meucci long to figure this out, and he asked his attorney to file a lawsuit with the Patent Office, as the Italian inventor had already patented his invention, albeit annually. A little later, thanks to a friend working in Washington, Meucci discovered that all documentation relating to Meucci's patent had been lost, so there was no proof that the telephone patent belonged to Meucci before Graham Bell registered it. That’s how we know Graham Bell as the father of the telephone. In 1892, Bell inaugurated the 1,520-km (944-mile) telephone link between New York City and Chicago.
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